package com.sky.service.impl;


import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.vo.OrderReportVO;
import com.sky.vo.SalesTop10ReportVO;
import com.sky.vo.TurnoverReportVO;
import com.sky.vo.UserReportVO;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    /**
     * 获取营业额统计数据
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        List<Double> turnoverList = new ArrayList<>();
       for(LocalDate date:dateList){
           //查询date日期对应的营业额数据,营业额数据为订单表中status=5的订单的总金额
           LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
           LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
           //select sum(amount) from orders where order_time >= date and order_time < date+1 and status=5;
           Map map = new HashMap();
           map.put("begin", beginTime);
           map.put("end", endTime);
           map.put("status", Orders.COMPLETED);
           Double turenover = orderMapper.sumByMap(map);
           turenover = turenover == null ? 0.0 : turenover;
           turnoverList.add(turenover);
       }
        return TurnoverReportVO
                .builder()
                .dateList( StringUtils.join(dateList, ","))
                .turnoverList( StringUtils.join(turnoverList, ","))
                .build();

    }
    /**
     * 统计指定时间段内的用户数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的新增用户数
        List<Integer> newUserList = new ArrayList<>();
        //存放每天的总用户数
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            //查询date日期对应的新增用户数
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end", endTime);

            Integer totalUser = userMapper.countByMap(map);

            map.put("begin", beginTime);
            //新增用户数量
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);

        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
               .totalUserList(StringUtils.join(totalUserList, ","))
               .newUserList(StringUtils.join(newUserList, ","))
               .build();
    }

    /**
     * 统计指定时间段内的订单数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();
        
        //遍历dateList,查询每天的订单数据
        for (LocalDate date : dateList) {
            //查询每天的订单总数
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            //查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //计算时间段内的订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算时间段内的有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //计算有效订单率
        Double orderCompletionRate = 0.0;
        if(totalOrderCount!= 0){
            orderCompletionRate =validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }
    /**
     * 销量排行榜
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");
        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }


    /**
     * 根据条件查询订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        
        return orderMapper.countByMap(map);
    }
}
